Automatic exposure time control circuit

Details Automatic exposure time control circuit Automatic exposure time control circuit

1973-12-28

1976-11-30

Adams, Jr., Russell E.

354 24, 354 50, 354 60A, G03B 708

Patent

active

039952843

ABSTRACT:
An automatic exposure time control circuit for use with a camera having a shutter. A light measuring circuit for measuring the scene brightness passing through the camera lens produces an electric signal proportional to the logarithm of the scene brightness. An A-D converter circuit converts the output signal from the light measuring circuit to a digital signal. A first decoder, having a plurality of output terminals, receives the converted, digital signal and produces an output at a corresponding one of the output terminals. An exposure time control circuit, comprising a binary counter having the same number of stages and output terminals as the number of output terminals of the first decoder is set to the output of the decoder upon release of the shutter. A pulse generator supplies a train of pulses to the binary counter of the exposure time control circuit, the latter counting a number of pulses corresponding to the output of the decoder to which it was set, thereupon closing the shutter and thereby controlling the exposure time.

REFERENCES:
patent: 3703130 (1972-11-01), Watanabe
patent: 3748979 (1973-07-01), Wada
patent: 3824608 (1974-07-01), Toyoda
patent: 3827065 (1974-07-01), Wada
patent: 3900855 (1975-08-01), Stempeck

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